Anomalous Nernst effect in the vortex-liquid phase of high-temperature superconductors by layer decouplingJ. P. Rodriguez
Department of Physics and Astronomy, California State University Los Angeles, CA 90032, USA
received 5 June 2006; accepted 13 July 2007
published online 2 August 2006
Linear diamagnetism is predicted in the vortex-liquid phase of layered superconductors at temperatures just below the mean-field phase transition on the basis of a high-temperature analysis of the corresponding frustrated XY model. The diamagnetic susceptibility, and the Nernst signal by implication, is found to vanish with temperature as (Tc0 - T)3 in the vicinity of the mean-field transition at Tc0. Quantitative agreement with recent experimental observations of a diamagnetic signal in the vortex-liquid phase of high-temperature superconductors is obtained.
74.25.Dw - Superconductivity phase diagrams.
74.25.Ha - Magnetic properties.
74.25.Qt - Vortex lattices, flux pinning, flux creep.
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